AT&T finally changed its mind and will let its Android handset owners install apps from unofficial sources. The wireless carrier will roll out an update to the Inspire 4G, Samsung Captivate, HTC Aria and LG Thunder in the next few weeks that will enable the sideloading of any Android app. Atrix 4G owners will have to wait for a maintenance release from Motorola before AT&T can enable sideloading.